Propose v6.1.0 (Openssl update)

DEPENDS ON https://github.com/nodejs/node/pull/6550

do not merge!

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• assert: deep{Strict}Equal() now works correctly with circular references. (Rich Trott) #6432
• debugger: Arrays are now formatted correctly in the debugger repl. (cjihrig) #6448
• deps: Upgrade OpenSSL sources to 1.0.2h (Shigeki Ohtsu) #6550
• net: Introduced a Socket#connecting property. (Fedor Indutny) #6404
  • Previously this information was only available as the undocumented, internal _connecting property.
• process: Introduced process.cpuUsage(). (Patrick Mueller) #6157
• stream: Writable#setDefaultEncoding() now returns this. (Alexander Makarenko) #5040
• util: Two new additions to util.inspect():
  • Added a maxArrayLength option to truncate the formatting of Arrays. (James M Snell) #6334
    • This is set to 100 by default.
  • Added a showProxy option for formatting proxy intercepting handlers. (James M Snell) #6465
    • Inspecting proxies is non-trivial and as such this is off by default.

Refs: https://github.com/nodejs/node/issues/6458